.num {
  width: 500px;
  text-align: center;
  padding: 20px;
  font-size: 20px;
}
.num h3 {
  width: 100%;
  padding: 15px;
}
.num span {
  padding: 0 20px;
}
.num button {
  font-size: 26px;
  padding: 25px;
  border-radius: 5px;
}